These EMD F7 A and B unit locomotives are painted aluminum in a yellow ‘Warbonnet’ scheme with blue on the nose, blue lettering and herald, and black and red ‘Hiawatha’ logo. The EMD F7 was a 1,500 horsepower (1,100 kW) Diesel-electric locomotive produced between February 1949 and December 1953 by the Electro-Motive Division of General Motors (EMD) and General Motors Diesel (GMD). A total of 2,366 cab-equipped lead A-units and 1,483 cabless booster or B-units were built.